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Retailers rounded up or down total purchases to the nearest 5c to avoid using 1c or 2c coins.

Ms Quirke said the feedback showed that it had all balanced out.

"Shops didn't make money on it and consumers didn't lose out. From everyone's point of view it was beneficial."

Asked whether it could work nationally, she said: "I think it can and I think it will. It seems to be very, very popular, certainly from the merchants' point of view.

"The consumers obviously would be a little worried that if the one and two cent were done away with completely, that we might be in a position where prices would rise.

"But from the Central Bank's point of view, the guidelines have been very, very strict with regard to the trial. And if any rollout nationally follows on the back of what has happened, I would have no hesitation in saying it's a good thing all round."